Contact: Lee J. Siegel
University of Utah
Caption: This male mouse has left brownish scent marks by depositing pheromone-rich urine on a fence separating his territory from those of other mice. A new University of Utah study found that when mother mice compete socially for mates in a so-called promiscuous environment, their sons produce more pheromones, making them more sexually attractive to female mice than the sons of mothers with only one mate.
Credit: Doug Cornwall, University of Utah.
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